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March 19, 2010 11:12am UTC

Strange error in transient analysis in RF-module

Hi,

I am doing a simple 2D in-plane transient wave propagation of electromagnetic field. At the input, there is a TM-plane wave from one boundary which then propagates and stumbles upon a metallic block.

The result I get is totally nonsensical. All of the field gets concentrated inside the metallic block! I tried changing different parameters like mesh refinement, trying different solvers, etc but none seemed to work. Then I tried to increase simulation time but got the following error message:

Error:
Time 1.576596030135143e-13:
Nonlinear solver did not converge.
Last time step is not converged.

I have tried since then different geometries and have noticed that in all of them the simulation fails if metals are included (negative permittivities) but behaves fine with dielectric. Is there some kind of limitation on transient analysis in comsol?

I shall appreciate if someone experienced could help me out. The model file is attached and the impeding block is subdomain 2 there.

Thanks

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